By updating the firmware, the lens will offer improved AF performance. Also, the latest firmware of the SIGMA MOUNT CONVERTER MC-11 EF-E will not only offer improved AF performance, but also enables the OS mechanism to start operating faster than before.

For customers who own the SIGMA USB DOCK, please update the firmware via SIGMA Optimization Pro. For those who own the SIGMA MOUNT CONVERTER MC-11 EF-E, please update the firmware via SIGMA Optimization Pro by connecting it to a computer using a supplied USB Cable.

* Before updating the MC-11 firmware, please ensure SIGMA Optimization Pro has been updated to ver. 1.4.1 or later for Windows, and ver. 1.4.0 or later for Macintosh from the following download page.

Applicable Products

SIGMA 100-400mm F5-6.3 DG OS HSM | Contemporary for Canon

Benefits of This Firmware Update

Improved the AF performance.

When attached to the SIGMA MOUNT CONVERTER MC-11 EF-E (ver. 1.06), the firmware update offers not only the improved AF performance, but also enables the OS mechanism to start operating faster than before.